CN103897529B - The preparation method of double-deck full-face spray light box film coating fluid - Google Patents
The preparation method of double-deck full-face spray light box film coating fluid Download PDFInfo
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Abstract
The invention discloses a kind of preparation method of double-deck full-face spray light box film coating fluid: after titanium dioxide and acrylate copolymer emulsion mixing, add tensio-active agent, then ethanol is added, shear in dispersion machine and obtain titanium white pre-dispersed liquid, add emulsion and polyvinyl alcohol solution to described titanium white pre-dispersed liquid again, after mending deionized water and stirring, obtain lower floor's coating fluid; Shear adding in dispersion machine after precipitated silica, deionized water, titanium dioxide mixing, obtain silicon-dioxide pre-dispersed liquid, sodium hydroxide solution is added again in described silicon-dioxide pre-dispersed liquid, shear obtained dispersion liquid, add emulsion and polyvinyl alcohol solution to described dispersion liquid, after mending deionized water and stirring, obtain upper strata coating fluid.Double-deck coating effectively can improve opacifying power and the blotting power of coating, thus avoids improving the problem that opacifying power easily causes coating thickening cracking.
Description
Technical field
The invention belongs to ink-jet printing media technical field, be specifically related to the preparation method of double-deck full-face spray light box film coating fluid.
Background technology
Lamp box panel (BacklitInkjetFilm) is the comparatively special class ink-jet media of structure, be widely used in exhibition room, market, subway station, signboard lamp box show.This type of medium generally containing ink absorbing layer and light diffusion layer two-layer, make lamp box time not be used in the additional scattering sheet of fluorescent tube, both can reflect viewing (when not playing lamp), again can transmission viewing (when playing lamp), use widely.
Lamp box panel base material generally selects thickness to be 100-150 μm, and optics transmittance is greater than 90%, the transparent polyester sheet base that mist degree is less than 2%; Ink absorbing layer is formed by there being the Clear coating of favourable absorption ability and anchoring capability to ink, thickness 10-20 μm; Light diffusion layer mainly plays a part to hide and infiltration, and have certain opacifying power (light absorption ratio is generally 30%), form through pore network containing a certain proportion of micron order pigment, thickness is 4-7 μm.For improving the sticking power between ink absorbing layer and polyester film base, generally bottoming process being done to base material, therefore having very thin adhesive coating between ink absorbing layer and polyester film base.
Ink-jet lamp box panel is divided into back of the body blowtorch box film and full-face spray light box film two kinds.The back of the body spray lamp box panel structure be designed to light diffusion layer upper, ink absorbing layer under.During printing, ink droplet is ejected into light diffusion layer surface, start transverse dispersion and longitudinal diffusion occur along hole, because ink absorbing layer is to the strong adsorption effect of ink solvent and tinting material, longitudinal diffusion speed significantly increases, the rapid penetrating light diffusion layer of major part tinting material, arrives ink absorbing layer, forms ink jet image in ink absorbing layer.Because ink absorbing layer and base material are highly transparents, therefore observe from polyester chips basal plane, image color is bright-coloured.When being arranged on lamp box, by polyester film base facing to viewer, image reflection viewing effect is good, and the polyester film base of high strength provides the good protection to image and lamp box simultaneously.
The structure design of full-face spray light box film is on the contrary with back of the body spray lamp box panel.After printing, printing surface makes lamp box toward the outside, from printing surface viewing image.Therefore, in the selection of pigment, full-face spray light box chip architecture should avoid tinting material in ink to infiltrate coat inside as far as possible, should select the pigment that opacifying power is low, specific surface area large, granule interior hole is abundant.Ink-vapor recording coating for full-face spray light box film needs to possess good ink absorption ability, opacifying power and transmittance etc., prior art is usually by silicon-dioxide, titanium dioxide, the obtained dispersion liquid of deionized water mixing, add special emulsion and the obtained coating fluid of polyvinyl alcohol solution mixing again, the full-face spray light box film obtained by this coating fluid easily turns yellow, fast light, weathering resistance is bad, opacifying power and transmittance are not high, easy dry linting.In addition, because silicon-dioxide opacifying power is not strong, for reaching suitable opacifying power, coating needs to increase titanium dioxide ratio, or thickeies.Improve titanium dioxide ratio, easily cause blotting not enough, add thick coating, after easily causing coating drying, have crack defect, affect the printing effect of product.
Summary of the invention
In order to overcome the above-mentioned defect that prior art field exists, the object of the invention is to, a kind of preparation method of double-deck full-face spray light box film coating fluid is provided, the full-face spray light box film solving prior art obtained easily turns yellow, fast light, weathering resistance is bad, opacifying power and transmittance are not high, the problem of easy dry linting.
Double-deck full-face spray light box film coating fluid provided by the invention divides two-layer up and down, and upper strata is ink absorbing layer, and lower floor is attachment covering layer.
The preparation method of double-deck full-face spray light box film lower floor provided by the invention coating fluid, comprises the following steps:
(1) under room temperature, by proportion by weight, 6 parts of titanium dioxides are joined in 6 parts of acrylate copolymer emulsions, then add 1 part of tensio-active agent, then add 7 parts of ethanol, add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity again, obtain titanium dioxide pre-dispersed liquid;
(2) at the temperature of 45 DEG C, get 20 parts of described dispersion liquid by proportion by weight and add polyvinyl alcohol solution 7 parts, mend deionized water 10 parts and stirs obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, standing froth breaking;
The preparation method of double-deck full-face spray light box film upper strata provided by the invention coating fluid, comprises the following steps:
(1) under room temperature, by proportion by weight, 64-72 parts of precipitated silica are joined in 340 parts of deionized waters, then 24-32 parts of titanium dioxide are added, add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity again, obtain silicon-dioxide pre-dispersed liquid, in described silicon-dioxide pre-dispersed liquid, add 20 parts of sodium hydroxide solutions again, shear 20 minutes with same rotational speed, obtained dispersion liquid;
(2) at the temperature of 45 DEG C, get 160 parts of described dispersion liquid by proportion by weight and add acrylate copolymer emulsion 21 parts, then add polyvinyl alcohol solution 84 parts, mend deionized water 20 parts and stirs afterwards and obtain coating fluid, described coating fluid is incubated at 45 DEG C of temperature, leaves standstill froth breaking;
The concentration of described sodium hydroxide solution is 2%, and the concentration of described polyvinyl alcohol solution is 10%; Pore volume 1.2-the 2.5ml/g of described precipitated silica, dispersion liquid aggregate particle size 1-25 μm; Described titanium dioxide is R type titanium dioxide.
The preparation method of double-deck full-face spray light box film coating fluid provided by the invention, its beneficial effect is, double-deck coating effectively can improve opacifying power and the blotting power of coating, thus avoids improving the problem that opacifying power easily causes coating thickening cracking.
Embodiment
Below in conjunction with six embodiments, the preparation method of double-deck full-face spray light box film coating fluid provided by the invention is described in detail.
Embodiment one
The preparation method of the double-deck full-face spray light box film coating fluid of the present embodiment,
One, lower floor's coating fluid is produced and is comprised the following steps:
(1) under room temperature, by proportion by weight, 6 parts of titanium dioxides 960 are joined 6 parts of acrylate copolymer emulsion PU600(AudioCodes specializations) in, then 1 part of tensio-active agent TX-10 is added, then 7 parts of ethanol are added, add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity again, obtain titanium dioxide pre-dispersed liquid;
(2) at the temperature of 45 DEG C, get by proportion by weight polyvinyl alcohol (PVA217) solution 7 parts that 20 parts of described dispersion liquid add 10% concentration, mend deionized water 10 parts and stirs obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, standing froth breaking;
Two, upper strata coating fluid is produced and is comprised the following steps:
(1) under room temperature, by 72 parts of precipitated silica SD690(space flight Sadens, pore volume 1.4-1.6ml/g, 5 μm, aperture (laser method)) join in 340 parts of deionized waters, then add 24 parts of titanium dioxide R960, then add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity, obtain silicon-dioxide pre-dispersed liquid, in described silicon-dioxide pre-dispersed liquid, adding 20 parts of concentration is again the sodium hydroxide solution of 2%, shears 20 minutes with same rotational speed, obtained dispersion liquid;
(2) at the temperature of 45 DEG C, 160 parts that get described dispersion liquid add acrylate copolymer emulsion PU600(AudioCodes specialization) 21 parts, add polyvinyl alcohol (PVA217) solution 84 parts that concentration is 10% again, mend deionized water 20 parts and stir obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, leaves standstill froth breaking.
Embodiment two
The preparation method of the double-deck full-face spray light box film coating fluid of the present embodiment,
One, lower floor's coating fluid is produced and is comprised the following steps:
(1) under room temperature, by proportion by weight, 6 parts of titanium dioxides 931 are joined 6 parts of acrylate copolymer emulsion B736(AudioCodes specializations) in, then 1 part of tensio-active agent TX-10 is added, then 7 parts of ethanol are added, add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity again, obtain titanium dioxide pre-dispersed liquid;
(2) at the temperature of 45 DEG C, get by proportion by weight polyvinyl alcohol (PVA217) solution 7 parts that 20 parts of described dispersion liquid add 10% concentration, mend deionized water 10 parts and stirs obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, standing froth breaking;
Two, upper strata coating fluid is produced and is comprised the following steps:
(1) under room temperature, by 64 parts of precipitated silica SD640(space flight Sadens, pore volume 1.4-1.6ml/g, 4 μm, aperture (laser method)) join in 340 parts of deionized waters, then add 32 parts of titanium dioxide R931, then add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity, obtain silicon-dioxide pre-dispersed liquid, in described silicon-dioxide pre-dispersed liquid, adding 20 parts of concentration is again the sodium hydroxide solution of 2%, shears 20 minutes with same rotational speed, obtained dispersion liquid;
(2) at the temperature of 45 DEG C, 160 parts that get described dispersion liquid add acrylate copolymer emulsion B736(AudioCodes specialization) 21 parts, add polyvinyl alcohol (PVA217) solution 84 parts that concentration is 10% again, mend deionized water 20 parts and stir obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, leaves standstill froth breaking.
Embodiment three
The preparation method of the double-deck full-face spray light box film coating fluid of the present embodiment, comprises the following steps:
One, lower floor's coating fluid is produced and is comprised the following steps:
(1) under room temperature, by proportion by weight, 6 parts of titanium dioxide R900 are joined 6 parts of acrylate copolymer emulsion E115(AudioCodes specializations) in, then 1 part of tensio-active agent TX-10 is added, then 7 parts of ethanol are added, add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity again, obtain titanium dioxide pre-dispersed liquid;
(2) at the temperature of 45 DEG C, get by proportion by weight polyvinyl alcohol (PVA217) solution 7 parts that 20 parts of described dispersion liquid add 10% concentration, mend deionized water 10 parts and stirs obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, standing froth breaking;
Two, upper strata coating fluid is produced and is comprised the following steps:
(1) under room temperature, by 72 parts of precipitated silica SD520(space flight Sadens, pore volume 1.6-1.8ml/g, 2 μm, aperture (laser method)) join in 340 parts of deionized waters, then add 24 parts of titanium dioxide R900, then add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity, obtain silicon-dioxide pre-dispersed liquid, in described silicon-dioxide pre-dispersed liquid, adding 20 parts of concentration is again the sodium hydroxide solution of 2%, shears 20 minutes with same rotational speed, obtained dispersion liquid;
(2) at the temperature of 45 DEG C, 160 parts that get described dispersion liquid add acrylate copolymer emulsion E115(AudioCodes specialization) 21 parts, add polyvinyl alcohol (PVA217) solution 84 parts that concentration is 10% again, mend deionized water 20 parts and stir obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, leaves standstill froth breaking.
Embodiment four
The preparation method of the double-deck full-face spray light box film coating fluid of the present embodiment, comprises the following steps:
One, lower floor's coating fluid is produced and is comprised the following steps:
(1) under room temperature, by proportion by weight, 6 parts of titanium dioxides 960 are joined 6 parts of acrylate copolymer emulsion PU600(AudioCodes specializations) in, then 1 part of tensio-active agent TX-10 is added, then 7 parts of ethanol are added, add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity again, obtain titanium dioxide pre-dispersed liquid;
(2) at the temperature of 45 DEG C, get by proportion by weight polyvinyl alcohol (PVA217) solution 7 parts that 20 parts of described dispersion liquid add 10% concentration, mend deionized water 10 parts and stirs obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, standing froth breaking;
Two, upper strata coating fluid is produced and is comprised the following steps:
(1) under room temperature, by 68 parts of precipitated silica SD690(space flight Sadens, pore volume 1.4-1.6ml/g, 5 μm, aperture (laser method)) join in 340 parts of deionized waters, then add 28 parts of titanium dioxide R960, then add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity, obtain silicon-dioxide pre-dispersed liquid, in described silicon-dioxide pre-dispersed liquid, adding 20 parts of concentration is again the sodium hydroxide solution of 2%, shears 20 minutes with same rotational speed, obtained dispersion liquid;
(2) at the temperature of 45 DEG C, 160 parts that get described dispersion liquid add acrylate copolymer emulsion PU600(AudioCodes specialization) 21 parts, add polyvinyl alcohol (PVA217) solution 84 parts that concentration is 10% again, mend deionized water 20 parts and stir obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, leaves standstill froth breaking.
Embodiment five
The preparation method of the double-deck full-face spray light box film coating fluid of the present embodiment, comprises the following steps:
One, lower floor's coating fluid is produced and is comprised the following steps:
(1) under room temperature, by proportion by weight, 6 parts of titanium dioxides 931 are joined 6 parts of acrylate copolymer emulsion B736(AudioCodes specializations) in, then 1 part of tensio-active agent TX-10 is added, then 7 parts of ethanol are added, add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity again, obtain titanium dioxide pre-dispersed liquid;
(2) at the temperature of 45 DEG C, get by proportion by weight polyvinyl alcohol (PVA217) solution 7 parts that 20 parts of described dispersion liquid add 10% concentration, mend deionized water 10 parts and stirs obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, standing froth breaking;
Two, upper strata coating fluid is produced and is comprised the following steps:
(1) under room temperature, by 66 parts of precipitated silica SD640(space flight Sadens, pore volume 1.4-1.6ml/g, 4 μm, aperture (laser method)) join in 340 parts of deionized waters, then add 30 parts of titanium dioxide R931, then add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity, obtain silicon-dioxide pre-dispersed liquid, in described silicon-dioxide pre-dispersed liquid, adding 20 parts of concentration is again the sodium hydroxide solution of 2%, shears 20 minutes with same rotational speed, obtained dispersion liquid;
(2) at the temperature of 45 DEG C, 160 parts that get described dispersion liquid add acrylate copolymer emulsion B736(AudioCodes specialization) 21 parts, add polyvinyl alcohol (PVA217) solution 84 parts that concentration is 10% again, mend deionized water 20 parts and stir obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, leaves standstill froth breaking.
Embodiment six
The preparation method of the double-deck full-face spray light box film coating fluid of the present embodiment, comprises the following steps:
One, lower floor's coating fluid is produced and is comprised the following steps:
(1) under room temperature, by proportion by weight, 6 parts of titanium dioxide R900 are joined 6 parts of acrylate copolymer emulsion E115(AudioCodes specializations) in, then 1 part of tensio-active agent TX-10 is added, then 7 parts of ethanol are added, add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity again, obtain titanium dioxide pre-dispersed liquid;
(2) at the temperature of 45 DEG C, get by proportion by weight polyvinyl alcohol (PVA217) solution 7 parts that 20 parts of described dispersion liquid add 10% concentration, mend deionized water 10 parts and stirs obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, standing froth breaking;
Two, upper strata coating fluid is produced and is comprised the following steps:
(1) under room temperature, by 70 parts of precipitated silica SD520(space flight Sadens, pore volume 1.6-1.8ml/g, 2 μm, aperture (laser method)) join in 340 parts of deionized waters, then add 26 parts of titanium dioxide R900, then add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity, obtain silicon-dioxide pre-dispersed liquid, in described silicon-dioxide pre-dispersed liquid, adding 20 parts of concentration is again the sodium hydroxide solution of 2%, shears 20 minutes with same rotational speed, obtained dispersion liquid;
(2) at the temperature of 45 DEG C, 160 parts that get described dispersion liquid add acrylate copolymer emulsion E115(AudioCodes specialization) 21 parts, add polyvinyl alcohol (PVA217) solution 84 parts that concentration is 10% again, mend deionized water 20 parts and stir obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, leaves standstill froth breaking.
Comparative example one
(1) under room temperature, by 64 parts of precipitated silica SD690(space flight Sadens, pore volume 1.4-1.6ml/g, 5 μm, aperture (laser method)) join in 336 parts of deionized waters, then add 36 parts of titanium dioxide R960, then add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity, obtain silicon-dioxide pre-dispersed liquid, in described silicon-dioxide pre-dispersed liquid, adding 20 parts of concentration is again the sodium hydroxide solution of 2%, shears 20 minutes with same rotational speed, obtained dispersion liquid;
(2) at the temperature of 45 DEG C, 160 parts that get described dispersion liquid add acrylate copolymer emulsion PU600(AudioCodes specialization) 21 parts, add polyvinyl alcohol (PVA217) solution 84 parts that concentration is 10% again, mend deionized water 20 parts and stir obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, leaves standstill froth breaking.
Comparative example two
(1) under room temperature, by 72 parts of precipitated silica SD520(space flight Sadens, pore volume 1.6-1.8ml/g, 2 μm, aperture (laser method)) join in 326 parts of deionized waters, then add 38 parts of titanium dioxide R900, then add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity, obtain silicon-dioxide pre-dispersed liquid, in described silicon-dioxide pre-dispersed liquid, adding 20 parts of concentration is again the sodium hydroxide solution of 2%, shears 20 minutes with same rotational speed, obtained dispersion liquid;
(2) at the temperature of 45 DEG C, 160 parts that get described dispersion liquid add acrylate copolymer emulsion E115(AudioCodes specialization) 21 parts, add the polyvinyl alcohol solution 84 parts that concentration is 10% again, mend deionized water 20 parts and stir obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, leaves standstill froth breaking.
Embodiment one to six is coated with dry rear coating appearance flawless, and printing test is without the black phenomenon of heap.
Comparative example one is coated with rear printing test, and coatingsurface has the black phenomenon of heap, and ink receptivity is obviously deteriorated; And comparative example two is coated with the dry rear a large amount of fine cracks of coatingsurface, after print image, have a strong impact on picture quality.
Claims (4)
1. a preparation method for double-deck full-face spray light box film coating fluid, is characterized in that: described coating fluid is divided into two-layer up and down,
Lower floor's coating fluid is produced and is comprised the following steps:
1) under room temperature, by proportion by weight, 6 parts of titanium dioxides are joined in 6 parts of acrylate copolymer emulsions, then add 1 part of tensio-active agent, then add 7 parts of ethanol, add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity again, obtain titanium dioxide pre-dispersed liquid;
2) at the temperature of 45 DEG C, get 20 parts of described dispersion liquid by proportion by weight and add polyvinyl alcohol solution 7 parts, mend deionized water 10 parts and stirs obtained coating fluid afterwards, described coating fluid is incubated at 45 DEG C of temperature, standing froth breaking;
Upper strata coating fluid is produced and is comprised the following steps:
1) under room temperature, by proportion by weight, 64-72 parts of precipitated silica are joined in 340 parts of deionized waters, then 24-32 parts of titanium dioxide are added, add the VELOCITY SHEAR 20 minutes being greater than 25m ∕ s in dispersion machine with dispersion impeller linear velocity again, obtain silicon-dioxide pre-dispersed liquid, in described silicon-dioxide pre-dispersed liquid, add 20 parts of sodium hydroxide solutions again, shear 20 minutes with same rotational speed, obtained dispersion liquid;
2) at the temperature of 45 DEG C, get 160 parts of described dispersion liquid by proportion by weight and add acrylate copolymer emulsion 21 parts, then add polyvinyl alcohol solution 84 parts, mend deionized water 20 parts and stirs afterwards and obtain coating fluid, described coating fluid is incubated at 45 DEG C of temperature, leaves standstill froth breaking.
2. the preparation method of double-deck full-face spray light box film coating fluid according to claim 1, is characterized in that: the concentration of described sodium hydroxide solution is 2%, and the concentration of described polyvinyl alcohol solution is 10%.
3. the preparation method of double-deck full-face spray light box film coating fluid according to claim 1, is characterized in that: the pore volume of described precipitated silica is 1.2-2.5ml/g, dispersion liquid aggregate particle size 1-25 μm.
4. the preparation method of double-deck full-face spray light box film coating fluid according to claim 1, is characterized in that: described titanium dioxide is R type titanium dioxide.
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| CN111117385A (en) * | 2019-12-24 | 2020-05-08 | 南阳柯丽尔科技有限公司 | Lamp box film coating liquid and preparation method thereof |
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| CN1775875A (en) * | 2005-11-25 | 2006-05-24 | 北京联创佳艺影像新材料技术有限公司 | Ink-jet coating liquid with cold point temperature |
| CN1795996A (en) * | 2004-12-30 | 2006-07-05 | 刘大佼 | Die set for coextrusion coat, and method for coextrusion coating two kinds of coats |
| CN101280141A (en) * | 2007-04-06 | 2008-10-08 | 刘建林 | Non-aqueous high-obstructing coating liquid and coat thereof |
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| CN1795996A (en) * | 2004-12-30 | 2006-07-05 | 刘大佼 | Die set for coextrusion coat, and method for coextrusion coating two kinds of coats |
| CN1775875A (en) * | 2005-11-25 | 2006-05-24 | 北京联创佳艺影像新材料技术有限公司 | Ink-jet coating liquid with cold point temperature |
| CN101280141A (en) * | 2007-04-06 | 2008-10-08 | 刘建林 | Non-aqueous high-obstructing coating liquid and coat thereof |
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